Alright, let's work through 80321329 times 12986691 step by step
80321329 × 12986691 = 12986691 × (80321329)
+ 12986691 × 9 yielding 116880219
+ 12986691 × 20 that equals 259733820
+ 12986691 × 300 which equals 3896007300
+ 12986691 × 1000 which equals 12986691000
+ 12986691 × 20000 that is equal 259733820000
+ 12986691 × 300000 giving us 3896007300000
+ 12986691 × 0000000 that equals 0
+ 12986691 × 80000000 which equals 1038935280000000

= 1043108280432339
